Material for heat insulating nano-material, mixing method of material, heat insulating nano-material and preparation method of heat insulating nano-material

Abstract

The invention relates to a material for a heat insulating nano-material, a mixing method of the material, the heat insulating nano-material and a preparation method of the heat insulating nano-material. The mixing method includes the steps: uniformly dispersing ceramic fibers by water, drying the uniformly dispersed ceramic fibers to obtain pre-dispersed ceramic fibers; mechanically fusing nano-powder, the pre-dispersed ceramic fibers and auxiliary dispersing agents selected from groups formed by sodium dodecyl benzene sulfonate, methylcellulose, carboxymethylcellulose and polyoxyethylene to obtain nano-heat insulating material. The preparation method of the heat insulating nano-material includes the steps: uniformly mixing 85-100% of materials and 0-15% of additives to obtain a mixed material; performing mold pressing on the mixed material to prepare the nano-heat insulating material. The material is uniformly mixed by the mixing method without destroying fiber shapes and a microstructure of the nano-powder. According to the method, the heat insulating nano-material with low density, low heat conductivity coefficient and excellent mechanical property can be prepared.

Description

technical field [0001] The invention belongs to the technical field of functional composite materials, and in particular relates to a material for a nano-insulation material and a mixing method thereof, a nano-insulation material and a preparation method thereof. Background technique [0002] High-temperature resistant fibers and nanopowders are the main raw materials for preparing high-performance nano-insulation materials. The main function of fibers is mechanical reinforcement, and the main function of nano-powders is to inhibit heat transfer. The two raw materials are uniformly dispersed and used to prepare high-efficiency nano-insulation materials. Thermal materials, so the quality of powder fiber pretreatment and mixing directly affects the performance of high-efficiency nano-insulation materials. [0003] In order to ensure better pretreatment and mixing of powder fibers, it is necessary to disperse the fibers and powder. From the perspective of fiber dispersion, the...

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Problems solved by technology

From the perspective of fiber dispersion, there are mainly physical dispersion and functional additive dispersion, but inorganic fibers are brittle, small in diameter, large in surface area, easy to bundle, and poor in fiber dispersion performance. At present, the main powder fiber dispersion methods are: 1. , Ultrasonic dispersion, which belongs to wet dispersion, and the material obtained by wet dispersion needs to remove the solvent in the subsequent preparation of nano-insulation materials, and the removal of the solvent will lead to an increase in the density of the material and an increase in the thermal conductivity of the material. High-performance nano-insulation materials cannot be produced; 2. Mechanical agitation and dispersion, strong mechanical agitation causes strong turbulent movement of liquid flow, resulting in particle aggregation and disintegration, fiber bundle disintegration, thereby accelerating dispersion, which also belongs to wet dispersion; 3. The kneader is mainly used for mixing and dispersing of high-viscosity, high-elastic-plastic materials, and the dispersing effect of dry low-viscosity fibers is not good; 4. Conventional mechanical dispersion is easy to cause fiber breakage, weaken the reinforcing effect, and limit the fiber The exertion of mechanical enhancement performance is not conducive to improving the comprehensive performance of nano-insulation materials

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